To enable a telephone service user or contractor to easily and quickly confirm the contents of the service procedure, the service rate, etc., to quickly and easily confirm the contents of the telephone service under application or contract and also to make a new contract or to change a contract.

A service user or contractor dials an exclusive service inquiry number (S1), a service contract information selection promotion guidance is given (S2), and the desired information is selected (S3). When the reference to the service application procedure is selected, the services are successively announced in the order of higher application frequency (S12). Then a service number is inputted for announcement of a desired service application procedure (S13), and the application procedure of the service designated by the service number is announced together with the service rate (S14).